How do i bring up therapy to my parents?

I'm suicidal. It sucks. It started about 2 years ago, i was very obvious about it, crying every night and morning, isolating myself etc. I got better for a few months and acted much "happier", and everyone thought i was fine. Now the same mindset has returned, but this time i'm much better at handling it- and by that i mean not making it obvious for others.

I'm much better now than how i started, but worse than i used to be, so i still feel like i'd benefit from some professional advice.

The big problem is that i'm a minor and have no money for anything like that. Of course- if i want anything i'd have to ask my parents for funds and support but i have no idea how to even start that conversation or what to say. I doubt "hey, i want to not be alive anymore" would be a sane thing to say or if it's even possible to formulate that into words that wouldn't cause panic. Do i lie why i want to go? What do i say if so? Or how do i even bring up not being entirely happy in life?